Chapter 3. That’s Refreshing

Concurrent HDL Code Execution with Seven-Segment Displays

In this chapter, I’ll be getting you familiar with the fundamental concept of HDL concurrency in FPGA design. The whole idea of HDL concurrency may be somewhat strange to you at first, especially if you are coming from a software programming background or have done some projects with an embedded microcontroller like an Arduino and created sketches in the C programming language for it.

The first thing you need to wrap your head around is that when you are coding in HDL, you are not writing a software program; rather, you are describing digital hardware logic functionality. With concurrency, there are no sequential steps of code execution like: “first do this, ...

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